public function init()
{
parent::init();
$session = \Yii::$app->session;
$flashes = $session->getAllFlashes();
$appendCss = isset($this->options['class']) ? ' ' . $this->options['class'] : '';
foreach ($flashes as $type => $data) {
if (isset($this->alertTypes[$type])) {
$data = (array) $data;
foreach ($data as $i => $message) {
/* initialize css class for each alert box */
$this->options['class'] = $this->alertTypes[$type] . $appendCss;
/* assign unique id to each alert box */
$this->options['id'] = $this->getId() . '-' . $type . '-' . $i;
echo \yii\bootstrap\Alert::widget(['body' => $message, 'closeButton' => $this->closeButton, 'options' => $this->options]);
}
$session->removeFlash($type);
}
}
}